Optimized Synthesis and Characterization of Janus RhSeCl with Uniform Anionic Valences, Nonlinear Optical and...

Area of Science:

• Materials Science
• Solid State Physics
• Chemistry

Background:

• Janus materials possess unique symmetry-breaking properties for multifunctional applications.
• Limited availability of stable Janus materials restricts their full potential and understanding.

Purpose of the Study:

• To synthesize and characterize the first millimeter-sized, intrinsically stable Janus material, RhSeCl.
• To investigate the structural, electronic, and optical properties of RhSeCl.
• To explore the potential applications of RhSeCl in optoelectronics and solar energy.

Main Methods:

• Chemical vapor transport (CVT) for synthesis.
• Single-crystal X-ray diffraction and high-resolution transmission electron microscopy for structural analysis.
• X-ray absorption near-edge structure (XANES) for electronic state analysis.
• Density functional theory (DFT) calculations for optical response analysis.

Main Results:

• Successful synthesis of millimeter-sized RhSeCl, confirming its Janus character.
• Unusual oxidation states of Rh and Se identified, crucial for Janus structure formation.
• Observation of strong second-harmonic generation (SHG) dependent on temperature, attributed to band nesting.
• High damage threshold exceeding Janus MoSSe.
• Promising optoelectronic performance in the visible spectrum (405-650 nm).

Conclusions:

• RhSeCl represents a significant advancement in stable, large-scale Janus material synthesis.
• The study deepens the understanding of inherent Janus structures and their formation mechanisms.
• RhSeCl shows great potential for applications in nonlinear optics and solar energy devices.